2009/06/04 by K. Lind, M. Asplund, P. S. Barklem · 6 citations
Physics and Astronomy · #Abundance (ecology) #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Atomic physics #Hydrogen #Ion #Ionization #Line (geometry) #Lithium (medication) #Materials science #Optics #Physics #Range (aeronautics) #Resonance (particle physics) #Spectral line #Stars #Stellar atmosphere #Stellar, planetary, and galactic studies #Ultraviolet #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361/200912221
4 pages, 3 figures, accepted by A&A
arxiv created 2009/06/04 · openalex publication_date 2009/07/02 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We perform non-LTE calculations of lithium in late-type stars for a wide range of stellar parameters, including quantum mechanical cross-sections for collisions with neutral hydrogen and the negative hydrogen ion. Non-LTE abundance corrections for the lithium resonance line at 670.7 nm and the subordinate line at 610.3 nm, are calculated using 1D MARCS model atmospheres spanning a grid <i>T<i/><sub>eff<sub/> = [4000, 8000] K, log <i>g<i/> = [1.0, 5.0], and [Fe/H] = [0.0, -3.0], for lithium abundances in the range <i>A<i/>(Li) = [-0.3, 4.2]. The competing effects of ultraviolet over-ionization and photon losses in the resonance line govern the behaviour of the non-LTE effects with stellar parameters and lithium abundance. The size and sign of the non-LTE abundance corrections vary significantly over the grid for the 670.7 nm line, but are typically positive and below 0.15 dex for the 610.3 nm, line. The new collisional data play a significant role in determining the abundance corrections.